Inertial Support by Virtual Synchronous Machine Control of a MMC-based VSC HVDC Link

The transition towards converter-interfaced generation replacing synchronous units is causing concerns over the frequency stability of the power system. Control strategies, recreating synchronous machines stabilising effects, can be implemented in static converters to provide an inertial response after a disturbance. This paper assesses the inertial support that can be supplied by Modular Multilevel Converters (MMCs) with a Virtual Synchronous Machine (VSM) control strategy in a Voltage Source Converter (VSC) High-Voltage Direct Current (HVDC) point-to-point link. To evaluate the inertial support and the resulting influence on the ac grid dynamics, the active power flowing in the link, the rate of change of frequency, and the frequency nadir of the ac grid are analysed. A time-domain sensitivity analysis is carried to show the effect of the VSM parameters on the power, frequency support and impact of converter saturation limits. The results demonstrate an improvement in the frequency behaviour of the ac grid dependent on the selection of the VSM parameters.

ISBN:978-1-83953-574-1

Jaar van publicatie:2021

Toegankelijkheid:Closed